exports.checkNotLogin = function (req, res, next){
	if (req.session.user) {
		req.flash('error', '已登录!');
		return res.redirect('back');
	}
	next();
};

exports.checkLogin = function (req, res, next){
	if (!req.session.user) {
		req.flash('error', '未登录!');
		return res.redirect('/signin');
	}
	next();
}